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PATENT OFFICE.

ANDREW L. BIKER, OF NEW YORK, N. Y.

DYNAMO-ELECTRlC M SPECIFICATION forming part of Letters Application filed November 25, 1887.

To aZZ whom it may concern.-

Be it known that 1, ANDREW L. BIKER, of New York city,in the county and State ofNew York, have invented a new and useful Inn provement in Dynamos and Electric Motors, which improvement is fully set forth in the following specification.

This invention has reference to the construc tion of dynamo-electric machines or motors, and has for its object to produce a compact machine, showing high efiiciency with the minimum cost and weight of metal. It has also been my aim to construct a machine capable of withstanding the continual jar incident to use as motors on land-vehicles, (street railways, for example.) Forsuch service it is important that the structure should possess great strength and rigidity between its several parts, which cannot be obtained in motors of certain welllrnown types.

The invention relates particularly to the construction of the field-magnets and the shape and manner of supporting the cores and polepieces. Each core and pole is in one piece, being drop-forged from wroughtiron. The core is cylindrical in form. The pole is approximately the form of a semi cylinder with its inner surface concaved to correspond with the curvature of the ring-armature. This form of pole-piece is found advantageous in that it presents no points or angles for scattering thelines oflorce, while itdispenses with all superlluous metal. The axis of each pole and core is a continuous straight line parallel with the axis of the armature, and these pieces are bolted firmly between the two uprights or side frames and constitute a part of the supportingfranie of the machine. One of these uprights is an iron casting and constitutes the yoke or neutral portion of the fieldmagnels. The other support, to which the pole ends of the magnets are bolted, is of brass or other non-magnetic metal. The construction is such as to facilitate manufacture and assemblage of the parts and to produce a very solid structure.

In the accompanying drawings, which form a part of this invention, Figure I is a side elevation of a fourpole dynamo or motor constructed in accordance with the invention, and Fig. II an end elevation thereof.

The construction of the armature A and commutator B is or may be such as described ACHiNE OR MOTOR.

Patent: No. 384,077, dated June 5, 1888.

Serial No. 256,l3l. (No model.)

in my application for patent, filed November 1, 1887, No. 253,971, and therefore requires no particular description here.

The uprights G D are supported by the bedplate E, and the core E and pole-pieces E" are secured firmly between them by means of bolts d,'the pieces E being at the four corners of the machine. Each core and its corresponding pole are in. one piece, and their axes are parallel with that of the armature shalt (t. The core portion F is cylindrical, and on it is wound the coil f in any suitable way. The exterior surface of the pole portion E has in cross-section the form of an arc of a circle of larger diameter than the core Its inner surface is curved in the opposite direction, the curvature corresponding with that of the armature A.

The upright O is preferably of cast iron. It constitutes the yoke or neutral portion of the magnets, and in it-is one bearing of the armature-shaft a.

The upright D is of brass or like metal, being in direct contact with the poles of the field-magnets. The field-magnets being placed at the corners of the maehine-that is to say, to the right and left of the armature instead of directly above and below the same-produces a more compact machine, the height and width thereof being but little more than the diameter of the armature.

The operation of the machine is the same as that of other well-known dynamos or motors, and therefore need not be described.

I claim- In a dynamo or motor,the combination, with the ring-armature, of the four field-magnets, each having its core and pole in one piece of wroughtiron, the outer surface of each pole having the form of an arc of a circle in crosssection, and the uprights to which said pieces are bolted at their ends, said magnets being parallel to the armature shaft and located at the four corners of a rectangle whose base is horizontal, substantially as described.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

ANDREW L. BIKER.

\Vitnesses:

A. PoLLoK, PHILIP Macao. 

